JPH057794B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to a magnetic tape wound between a pair of tape reels rotatably mounted in a cassette half constructed by combining upper and lower halves. The present invention also relates to a tape cassette having an elastic plate for preventing the magnetic tape from loosening.

[Conventional technology]

In general, tape cassettes used in tape recorders and video tape recorders have a certain amount of clearance between the cassette half and the tape reel wound with magnetic tape stored in the cassette half. The tape reel is set so as to be separated from the inner surfaces of the upper and lower halves of the tape cassette when the cassette is installed in a tape recorder or the like.

However, in reality, since the tape reel is free to rotate when the tape cassette is not in use, the magnetic tape tends to loosen at the cassette opening window, making it difficult to install the tape cassette in a tape recorder, etc., or when handling the tape cassette. The loosening becomes noticeable due to the vibrations received during this process. Such loosening of the magnetic tape not only causes damage to the magnetic tape in the cassette opening window, but also causes damage to the magnetic tape held by the opening window cover when opening/closing or rotating the opening window cover. This brings about various inconveniences such as wrapping around the loading means.

In order to solve this problem, a tape cassette as shown in FIG. 1 has been proposed in which the magnetic tape wound around the tape reel is prevented from loosening.

This will be briefly explained below. In FIG. 1, 1 is a lower half that is combined with an upper half to form a cassette half. On the inner surface of this lower half 1, as is well known, a pair of tape reels 2, 3. Guide rollers 7 and 8 are disposed near the guide pins 4 and 5 and the opening window 6. Also,
Both ends of the magnetic tape 9 are attached to the tape reels 2 and 3.
The magnetic tape 9 is fixed to and wound around the hub of the magnetic tape 9, and is guided along the guide pins 4 and 5 and the guide rollers 7 and 8, and faces the opening window 6. Further, on the inner surface of the lower half 1, in the vicinity of the tape reels 2 and 3, upright pieces 10 and 11 are provided in a protruding manner.

On the other hand, 12 and 13 are members for preventing loosening of the magnetic tape 9, and a lubricating part 1 such as a Teflon sheet with a small coefficient of friction is attached to the tip of elastic plates 14 and 15 made of Mylar etc.
6, 17 are attached, and at the other end, an adhesive tape (double-sided tape) 18, for attaching the elastic plates 14, 15 to the upright pieces 10, 11, is attached.
19 is installed.

The elastic plates 14 and 15 are attached to the adhesive tape 1.
The liners 8 and 19 are peeled off and the other end portions are attached to the upright pieces 10 and 11. Therefore, the lubricating parts 16 and 17 of the elastic plates 14 and 15 are located between the guide pin 4 and the guide roller 7 and between the guide pin 5.
and the guide roller 8.
is pressed as shown in FIG. 1 to prevent loosening.

[Problem to be solved by the invention]

However, since the anti-loosening members 12 and 13 of the magnetic tape 9 have adhesive parts as described above, the adhesive parts may gradually become fatigued and peeled off due to various forces, or there may be variations in the strength of the adhesive. Not only is it impossible to bring the lubricating parts 16 and 17 into contact with the magnetic tape 9 with an equal pressing force, but also the adhesive sticks to the magnetic tape 9 due to leakage, impairing its stable running and smooth running. record,
The disadvantage was that the playback operation was hindered. Furthermore, it is difficult to accurately position the elastic plates 14, 15 when they are installed inside the cassette half. Furthermore, since the elastic plates 14 and 15 are attached to the upright pieces 10 and 11 using adhesive tapes 18 and 19, it is difficult to automate their attachment, and there are various drawbacks such as an increase in overall manufacturing costs. It was hot.

Therefore, in view of the above-mentioned drawbacks of the conventional technology, a holding part of an elastic plate having a lubricating part that contacts the magnetic tape is arranged near the running path of the magnetic tape on one of the upper and lower halves. The above-mentioned elastic plate is held very easily and accurately in a fixed position by this holding part, and while the magnetic tape is stably running, the elastic plate is prevented from loosening freely, unlike the conventional tape cassette. There is a tape cassette that completely eliminates the adhesive structure of the plates, and makes it easy to run the magnetic tape stably, attach the elastic plate to an accurate position, and automate the attachment.

By the way, in the case where the elastic plate is fixed in the tape cassette by inserting and holding the elastic plate into the holding part, in order to prevent the elastic plate from coming off from the holding part, the fixed end side of the elastic plate is A fitting notch is provided in the.

However, since the elastic plate is housed in the cassette half and presses the magnetic tape with a certain pressing force, it has to be formed to have approximately the same width as the magnetic tape. Therefore, for example, in the case of home video tapes, etc.
Since the tape width is narrow, if a fitting notch is provided in the elastic plate formed to have a width corresponding to the tape width, there is a problem that the strength of the elastic plate cannot be maintained at the notch.

Therefore, the present invention has been proposed to solve the above-mentioned problem, and is designed to prevent the elastic plate from coming off from the holding portion without providing a fitting notch in the elastic plate.

[Means to solve the problem]

In order to achieve the above object, the tape cassette according to the present invention includes a pair of tape reels, a magnetic tape wound between these tape reels, one end of which is fixed, and the other end of which is in contact with the magnetic tape. The cassette half includes an upper and a lower half in which a flat sheet-like elastic plate made of synthetic resin is formed with a lubricating part, and the lubricating part is located on the fixed end side of the flat sheet-like elastic plate. a pair of fitting protrusions protruding upward and downward to make the width wider than the width of the holder, and at least one of the upper and lower halves has a bag-shaped slit integrally planted on the inner surface thereof. A stopper portion is provided in a part of the slit to face the fitting protrusion and prevent the flat sheet-like elastic plate from moving in the horizontal direction. By inserting the flat sheet-like elastic plate into the upper or lower half from below or above, and engaging one of the pair of fitting protrusions with the stopper part, the flat sheet-like elastic plate is One end of the plate is held in the holding portion.

[Effect]

According to the present invention, the fitting protrusion provided on the elastic plate engages with the stopper portion provided in the holding portion, thereby preventing horizontal movement of the elastic plate and fixing the elastic plate, thereby preventing the elastic plate from coming off from the holding portion. is planned.

(Example) Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 2 is a plan view showing the main parts of a tape cassette according to an embodiment of the present invention, that is, a plan view showing the lower half excluding the upper half.

The tape cassette shown in FIG. 2 has the same basic structure as that shown in FIG.

In this FIG. 2, reference numerals 20 and 21 are holding members having a U-shaped cross section that are integrally planted inside the lower half 1 which is combined with the upper half to form the cassette half. It is provided near the tape reels 2 and 3 which are rotatably housed. The holding members 20, 21 are symmetrical, and one of them will be explained with reference to FIGS. 3 and 4. That is, the holding member 20 is attached to the front plate 22 and the rear plate 2 so as to form the slit 51.
3. Consisting of a bottom plate 24 and a side plate 25, the front plate 22
Projections 26 and 27 are provided on the inner surface near the opening on one side and at the center of the inner surface of the rear plate 23 so as to bulge out toward the slit 51 in an alternating manner. Further, a stopper portion 28 is erected near the one side plate 25 on the bottom plate 24.

On the other hand, 29 and 30 have one end connected to the holding member 20,
21 is the aforementioned elastic plate engaged with. That is, the elastic plates 29 and 30 are made of synthetic resin such as Mylar and are formed into thin flat sheets as shown in FIGS. 5 and 6. These elastic plates 29 and 30 are
As shown in the figure, one of them is constructed as follows. That is, this elastic plate 29 is provided with a pair of fitting protrusions 31 and 32 that protrude equally upward and downward so that the width W ₂ is wider than the width W ₁ of this elastic plate 29 at one end that is the fixed end side. There is. These fitting protrusions 31 and 32 are intended to prevent the elastic plate 29 from coming off from the holding member 20.

In addition, a lubricating part 33 made of a Teflon sheet or the like, which is a lubricating material with a small coefficient of friction, is fitted onto the other end of the elastic plate 29 and is formed to have the same width _W1 as the elastic plate 29. This allows good sliding on the magnetic tape 9 and prevents static electricity from being generated on the magnetic tape 9 that comes into sliding contact with the magnetic tape 9.

The reason why the fitting protrusions 31 and 32 are provided to prevent the elastic plate 29 from coming off from the holding member 20 is that the width W ₁ of the elastic plate 29 is approximately the same as the width of the magnetic tape 9. Therefore, for example, in the case of a home video tape, the tape width is narrow, and if a fitting notch is provided as a stopper in the elastic plate 29 corresponding to this tape width, the elastic plate 29 itself will not fit in this notch. This is because there is a risk that the strength cannot be maintained.

The elastic plate 29 has one fixed end having fitting protrusions 31 and 32 inserted between the protrusions 26 and 27 provided in the slit 51 of the holding member 20, as shown in FIG. While being inserted into the slit 51, the lower fitting protrusion 32 engages with the stopper portion 28 provided within the holding member 20, and is fixed within the holding member 20. and,
The elastic plate 29 is attached with one end securely fixed inside the holding member 20, and is prevented from coming off. Further, as shown in FIG. 7, the other end of the elastic plate 29 to which the lubricating portion 33 is attached is given appropriate elasticity as shown by the dotted line, so that it can press against the surface of the magnetic tape 9.

Note that the elastic plate 29 is not limited to the above-mentioned example; as shown in FIG. 8, a fitting protrusion 37 may be formed only on the lower edge of one end on the fixed side, if necessary.

Further, the stopper portion of the holding member 20 that is engaged with the fitting protrusion 32 of the elastic plate 29 may be a fitting notch corresponding to the fitting protrusion 32.

Next, FIGS. 9 and 11 show the holding member 20
Another example is shown in which the holding member 20 is open on the upper side and the left side in the figure, has an arc-shaped slit 38 for inserting the elastic plate 29, and has a bottom upper surface corresponding to the stopper part 28. Stopper part 3
9 are arranged in a row. In addition, this stopper part can be made into a notch if necessary. Into the holding member 20 having such a configuration, either the elastic plate 29 shown in FIG. By engaging the elastic plate 29 with the stopper part 39, one end of the elastic plate 29 is stably held within the holding member 20, and the other end where the lubricating part 33 is provided is held as shown by the dotted line in FIG. The lubricating portion 33 at the tip can be brought into contact with the magnetic tape 9 with appropriate pressure. Therefore, the magnetic tape 9 is prevented from flowing out or loosening unnecessarily. Note that the holding member and the elastic plate described above may be similarly employed in the upper half that is combined with the lower half, and both halves are constructed in the same manner.

In addition, the stopper parts 28 and 39 formed in the slits 51 and 38 are engaged with the fitting protrusions 32 and 39, respectively.
It is formed as deep or shallow as appropriate according to the size of 37.

〔Effect of the invention〕

According to the present invention having the above-described configuration,
The fitting protrusion provided on the elastic plate engages with the stopper provided in the holding part, thereby preventing horizontal movement of the elastic plate and ensuring that the elastic plate does not come off from the fixed holding part. can be prevented. Further, since the elastic plate is not provided with a fitting notch at the end on the side of the holding portion, the strength of the elastic plate can also be guaranteed.

Therefore, in conventional tape cassettes in which the elastic plate is bonded to a predetermined location within the cassette half using an adhesive, the adhesive portion may peel off as the elastic plate becomes fatigued, or it may become difficult to accurately set the bonding position. This eliminates the difficulty of staining the magnetic tape due to adhesive leakage or protrusion, and it also makes it easier to automate the attachment of elastic plates, lowering manufacturing costs, and speeding up the process. It is possible to provide a tape cassette with rich characteristics.

The elastic plate prevents the magnetic tape inside the cassette half from loosening when not in use, and reliably prevents the magnetic tape from unnecessarily flowing out from inside the cassette half or loosening.

Furthermore, the elastic plate, which is fixed at one end and elastically displaceable with the other end formed with a lubricating part formed as a free end, can be reliably positioned and supported within the cassette half. Looseness can be more reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the lower half of a conventional tape cassette. FIG. 2 is a plan view of the lower half side showing an embodiment of the tape cassette according to the present invention, FIG. 3 is a plan view of the holding member constructed in the lower half, and FIG. FIG. 5 is a front view of the elastic plate held by the holding member, FIG. 6 is a plan view thereof, and FIG. 7 is a partially cutaway sectional view of the elastic plate held by the holding member. It is a top view showing a state. 8 is a front view showing another example of the elastic plate, FIG. 9 is a plan view showing another example of the holding member, FIG. 10 is a partially cutaway sectional view thereof, and FIG. The figure is a plan view showing a fitted state of the holding member and the elastic plate. 1...lower half, 9...magnetic tape, 10,1
1, 20, 21...holding member, 12, 13, 29,
30... Elastic plate, 16, 17, 33... Lubrication part, 2
8, 39... Stopper part, 31, 32... Fitting protrusion,
51,38...slit.

Claims (1)

[Claims] 1. A pair of tape reels 2 and 3, a magnetic tape 9 wound between these tape reels 2 and 3, and a lubricating section 33 that is fixed at one end and contacts the magnetic tape 9 at the other end. A cassette half consisting of an upper half 1 and a lower half 1 accommodates flat sheet-like elastic plates 29 and 30 made of synthetic resin formed with a cassette half, and a fixed end side of the flat sheet-like elastic plates 29 and 30. has a pair of fitting protrusions 3 which protrude upward and downward to be wider than the width of the lubricating part 33.
1 and 32, and holding portions 20 and 21 having bag-shaped slits 51 and 38 are formed on the inner surface of at least one of the upper and lower halves 1, and are integrally planted with the halves 1, In addition, a part of the slits 51, 38 is provided with the flat sheet-like elastic plate 29,
Stopper part 2 that prevents horizontal movement of 30
8, 39 are provided opposite the fitting protrusions 31, 32, and the flat sheet-like elastic plates 29, 30 are inserted into the slits 51, 38 from below or above the upper or lower half 1. and insert one of the pair of fitting protrusions 31 and 32 into the stopper part 2.
8 and 39, the above-mentioned flat
A tape cassette in which one ends of sheet-like elastic plates 29, 30 are held in the holding parts 20, 21.